A lesson from Napoleon. On the morning of the Battle of Waterloo he said to his generals
"I tell you Wellington is a bad general, the are bad soldiers; we will settle this matter by lunchtime." Mmmm I bet he regretted that one!
With hindsight a little humility would have been great. How often does this happen to you, often without you knowing. Is there something like pride that is clouding your judgement? What are you not seeing? Who are you undervaluing and not giving sufficient attention to?